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c++pointerscharbuffer
user3800036
user3800036

Reputation: 105

How to create a pointer to a buffer from char []

If you have the memory address of a buffer, and this address is stored in a char, for example: char bufferAddress[] = "0024ABC3", how can you create a pointer using bufferAddress so that you can access variables in the buffer?

Upvotes: 1

Views: 2369

Answers (2)

Vlad from Moscow
Vlad from Moscow

Reputation: 310980

You can do the task using std::istringstream. For example

#include <iostream>
#include <sstream>

int main() 
{
    char bufferAddress[] = "0024ABC3";
    std::istringstream is( bufferAddress );
    void *p;

    is >> p;

    std::cout << "p = " << p << std::endl;  

    return 0;
}

The output is

p = 0x24abc3

If the buffer has type char * then you can reinterpret this pointer to void to pointer to char. For example

char *buffer = reinterpret_cast<char *>( p );

Upvotes: 3

jackarms
jackarms

Reputation: 1333

If you can get the string into a number, then you can try something like this:

void *ptr = reinterpret_cast<void*> (0x0024ABC3);

There are a few other threads on here that deal with assigning addresses to pointers directly, so you could check those out as well. Here's one: How to initialize a pointer to a specific memory address in C++

Upvotes: 3

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